On Performance of Two-Parameter Gompertz-Based Control Charts

Table 1

Control limits for skewness correction, Gompertz Shewhart, Gompertz skewness correction, and Gompertz exact control charts.

Sample size	Skewness correction		Gompertz Shewhart		Gompertz skewness correction		Gompertz exact
	LCL	UCL	LCL	UCL	LCL	UCL	LCL	UCL
2	0	0.617	0	0.2266	0	0.2287	0.0003	0.2810
3	0	0.573	0.0135	0.1470	0.0126	0.1462	0.0005	0.1791
4	0	0.491	0.0209	0.1515	0.0204	0.1510	0.0004	0.2004
5	0	0.469	0.0315	0.1256	0.0309	0.1250	0.0006	0.1658
7	0	0.402	0.0454	0.1169	0.0448	0.1163	0.0009	0.1555
10	0	0.328	0.0563	0.1018	0.0560	0.1014	0.0021	0.1303